rive.google.com Review1.pdf Google Drive Open with https://doc-08-9c 20.Research
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rive.google.com Review1.pdf Google Drive Open with https://doc-08-9c 20.Research has suggested that there is a correlation between Intenet usage and obesity. Using this information, a fictional study found a correlation of r79 between the number of hours of daily Internet usage and Body Mass Index, a measure of body weight. Which of the following is true? There is a pretty strong positive linear relationship between the number of hours spent on the internet and the Body Mass Index scores. a. b. Using the Internet causes people to gain weight. c. Physical activity is a possible "lurking variable behind this relationship. since people, who spend a large amounts of time using the Internet may be more likely to be less physically active. d. Both (a.) and (c.) are correct. e. None of the above are correct. 21. The tourism industry hires a marketing company to promote overseas vacations. The marketing companies research shows a +0.72 correlation between the number of overseas vacations booked and amount of free time, in days, people have each year. Therefore, the marketing company decides to develop an advertising campaign aimed specifically at people who have lots of free time. Which of the following is true about this decision? a. The decision may not be a good one, since it is possible that there is a lurking variable, such as income, behind both the number of booked overseas vacations and the number of free days people have each year. people have cause them to book more vacations. between number of booked vacations and the amount of free days people b. The decision is a good one, since we know that the number of free days c. The decision is a good one, since there is a strong positive relationship have each year. d. Both (b) and (c) are correct e. None of the above are correct.Explanation / Answer
Q 20 : Answer : d. Both a and c are correct.
Explanation : Choice (a) is correct because of the positive correlation coefficient. But this correlation may be due to some other hidden variable like physical activity. So (c) is also correct.
Q21 : Answer : a. The decision may not be .......
Explanation : Clearly, income is the most probable lurking variable that might be responsible for the numerical positive correlation coefficient and actually there may not be any relationship between free time and no. of vacations booked.
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